Valve-gear for explosive-engines.



No. 672.202. Patented A r; l6, mm. H. A. BERTHEAU.

VALVE GEAR FOR EXPLOSIVE ENGINES.

(Application filed Jan. so, 2899.) (No Model.) 3 Sheats-Sheat l.

No. 672,202. Patented Apr. I6, I90l. H. A. BERTHEAU.

VALVE GEAR FOB EXPLOSIVE ENGINES.

(Application filed Ian. 30, 1899.) (No Model.) 3 SheatsSheet 2.

No. 672,202.. Patented Apr. l6, l90l.

H. A. BERTHEAU. VALVE GEAR FOR EXPLOSIVE ENGIN ES.

(Application filed Jan. 30. 1899.)

(No Model.) 3 Sheets-Sheet 3.

UNITED STATES PATENT ()FFICE.

HENRIK AUGUST BERTHEAU, OF STOCKHOLM, SWEDEN.

VALVE-G EAR FOR EXPLOSlVE-ENGINES.

SPECIFICATION forming part of Letters Patent N 0. 672,202, dated April16, 1901.

Application filed January 30, 1899. Serial No. 708,931. (110 model.)

To alt whom it may concern: I

Be it known that I, HENRIK AUGUST BER- THEAU, engineer, of FlemminggatanNo. 47, Stockholm, Sweden, have invented certain new and usefulImprovements in Devices for Reversing the Rotary Direction of Gas andPetroleum Engines; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and tocharacters of reference marked thereon,which form a part of thisspecification.

This invention has relation to reversinggear for engines, and moreparticularly to reversing-gear for hydrocarbon and similar motive-fluidengines.

The object of this invention is to simplify the construction ofreversing-gearing by materially reducing the number of the operativeparts and by so arranging and combining the same that the gear-wheelthrough which motion is imparted to the valve-rod from a gear on thepower-shaft instead of being displaced in reversing revolves on a fixedpivot.

That my invention may be fully understood, I will describe the same indetail, reference being had to the accompanying drawings, in which-Figure 1 is an elevation, partly in section, of my improvedreversing-gear. Fig. 2 is a transverse sectional View thereof. Fig. 3 isa diagram illustrating the position of parts during the rotation of thecrank-shaft in opposite directions. Fig. 4 is an elevation illustratinga structural modification; and Fig. 5 shows two gas engines on a commonbed equipped with valves, as shown and described in Letters Patentgranted to me August 14, 1900, No. 655,751, and one of said engines isalso provided with a starting mechanism, as shown in said patent, withthe reversing mechanism applied so as to operate both engines.

As shown in Fig. 5, the reversing-gear is applied to a pair of explosivefour-stroke cycle gas-engines 2 3, mounted on a base 4, conforming tolines of a boat they are designed to drive by means of thepropeller-shaft 7", said shaft being provided with a fly-wheel 5. Thestarting mechanism is designated by 6,

and the exhaust-valve by 7. 8 is the valve controlling gas underpressure, and 9 and 10 bell-crank levers, all of which operate andperform their functions as described in the above-mentioned patent. Airis drawn in through spring-controlled air-inlet valves 11.

rom the engine base or framing and straddling the crank-shaft r rises astandard q, in which a spindle c has its bearings, and on said spindle cis secured a gear-wheel h, meshing with a like wheel 11, secured to thepowershaft 1 of the engine. On the spindle cis secured a crank-disk s,and on the bearing for said spindle is loosely mounted thereversinglever a, whose lockingarm is adapted to move over a notchedsector preferably formed integral with the standard q, as shown in Fig.2.

To the wrist-pin Z of the disk 3 is pivoted one end of a link d, theother end of which is pivoted to one end of a connecting-rod 6, whoseopposite end is pivotally connected with the valve-operating rod f inthe usual manner, and a link b is pivotally connected with thereversing-lever a and with the pivotal connection of the link (1 andconnectingrod e, as plainly shown in Fig. 1, which shows the parts intheir normal position, in which position said parts are also shown infull lines diagrammatically in Fig. 3.

In the described arrangement it will be observed that the pivotal pointof the links I) d and connecting-rod e oscillates during the ro tationof the crank-disk s in substantially a radial line through the points 00c, the connecting-rod e moving in a vertical plane and impartingareciprocating movementin a horizontal plane to the valve-operating rodf. As shown in Fig. 4:, said pivotal point of the links I) d and rod 8may be caused to move in substantially a radial line by providing thereversing-lever awith a longitudinally-slotted radial arm m, whose slotforms a guide for a slide-block 10, that carries the pivot-pin for thelink d and rod 6, said arm m taking the place of the link I). It willfurther be observed that during the movements of the reversing lever thepoint of connection between the rod e and link d will describe an arc ofa circle having for center the wrist-pin I, thus insuring an easy motionof the latter and of the parts operated thereby.

I have hereinbefore stated that the valvecontrolling mechanism is shownin its normal position in Fig. 1 and in full lines in the diagram Fig.2, the gears handt' revolving in the direction of the arrow-headsthereon. If the reversing-lever a is now shifted from its position 1(shown in full lines in said diagram) to the position 2, (shown indotted lines,) the position of the link (1 and rod 6 will be shiftedfrom one side of a line extending from the valve-operating rod andintersecting the axis of rotation of the spindle c to the opposite sideof said line, thereby reversing the operation of the valve, causing thepower-piston to reverse the rotation of the power-shaft, as will bereadily understood, the proportion of the gear-wheels t' and it being ofcourse as one t0 two.

It is readilyseen from Fig. 3 that, as shown in full lines, thevalve-rod e is moving toward the right, because (1 and 0 Z are at anangle and are coming into alinement.

This device being shown in connection with a four-stroke cyclecngine,let us say that in this quadrant (that through which the pin Z is aboutto move) the exhaust-valve will be operated and the piston will movefrom left i to right. In the second quadrant the valverod will nearlycomplete its stroke, as is evident froin the diagram, while the pistonis moving from right to left and taking in gas in order to reverse, thewheels 7t and i must necessarily travel in a contrary direction to thatindicated, and it is readily seen that if the lever a were not moved andwe are to open the exhaust-valve in the first quadrant of revolution ofthe pin Z, as in the abovedescribed cycle, it could not be done, becauseNow the valve would be part way on its stroke to left d and 10, making adecreasing angle) instead of moving to the right to operate theexhaust-valve. Now to remedy this and operate the valve at the properperiod we throw the lever a into position 2, so that (l and lo make anincreasing angle and tend to come into alinement. The fourth quadrant ofthe above-described circle will now become the first for reverserunning, and the valve-rod, by reason of the new position of theoperating parts, will, as before, he moved to the right and begin itsstroke, while the piston moves from left to right to exhaust; nearlycomplete the stroke of the valve-rod in the second quadrant While thepiston takes gas and moves from right to left; complete the stroke ofthe valve-rod and begin the return in the third quadrant while thepiston is compressing its charge; nearly completing its return stroke inthe fourth quadrant while the piston is forced out by the explosion ofthe charge, and completing its return and beginning the second stroke ofthe valve-rod, meanwhile operating the exhaust-valve.

Having thus described my invention, what I claim as new therein, anddesire to secure by Letters Patent, is

In a reversing mechanism, the combination with the power-shaft, atransmitting-gear thereon and a valve-operating rod, of a crankdisk, awrist-pin thereon and a gear on the spindle of the crank-disk meshingwith the first-mentioned gear, a reversing-lever loose on the spindle ofsaid crank-disk and provided with a slotted radial arm, a slide-blockhaving motion in said slotted arm, a connecting-rod connecting thevalve-operating rod with said block, and a link connecting the latterwith the wrist-pin, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed myname ill presence of two subscribing witnesses.

HENRIK AUGUST BER'IHEAU.

Witnesses:

TH. TRAWRINsKY, M. GENBERG.

